12356252561561 has 2 divisors, whose sum is σ = 12356252561562. Its totient is φ = 12356252561560.

The previous prime is 12356252561551. The next prime is 12356252561603. The reversal of 12356252561561 is 16516525265321.

12356252561561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7779887670025 + 4576364891536 = 2789245^2 + 2139244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12356252561561 is a prime.

It is not a weakly prime, because it can be changed into another prime (12356252561531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6178126280780 + 6178126280781.

It is an arithmetic number, because the mean of its divisors is an integer number (6178126280781).

Almost surely, 2^{12356252561561} is an apocalyptic number.

It is an amenable number.

12356252561561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12356252561561 is an equidigital number, since it uses as much as digits as its factorization.

12356252561561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240000, while the sum is 50.

The spelling of 12356252561561 in words is "twelve trillion, three hundred fifty-six billion, two hundred fifty-two million, five hundred sixty-one thousand, five hundred sixty-one".